Flyer&#39;s boot



June 25, 1946. E. M. BONYHADY FLYER S BOOT Filed Oct. 15, 1945 UIMHIIMMHHDHIINMHII HMH INVENToR. v

ve z'l M. .5a/Whoa?? B Y A T TRNE Y Patented `une 25,1946

UNITED STATES PATENT OFFICE FLYERS BOOT Emil M. Bonyhady, Worcester, Mass.

Application October 15, 1943, Serial No. 506,354

(Cl. SiS-2.6)

Claims. l

This invention relates to new and useful improvements in a flyers boot,

More specifically, the invention proposes the construction of a flyers boot characterized by an outer boot into which an inner slipper is adapted to be inserted with means provided between the adjacent top edges of the boot and slipper' for connecting them together as an integral unit in a manner to prevent relative shifting of the boot and slipper when being worn.

Still further it is proposed to provide the inner faces of the slipper with heating windings connected with an electric cable adapted to connect with a source of electric current in a manner to provide heat required to keep the flyers feetV warm when ilying at extremely high altitudes.

Another object of the invention proposes mounting the heating windings between ilexible mounting strips of asbestos or other similar materials in a manner to provide a means by which.

the windings may be mounted in position and to contain the windings to prevent the boot from being set are by the windings when in operation.

Still another object of this invention proposesstitching the flexible mounting strips to the inside face of the inner slipper in a manner to secure the winding in position Within the slipper.

A further object of the invention proposes the` provision of means for adjustably mounting the flexible mounting pieces in position within the slipper in a manner so that the position of the heating windings may be adjusted relative to the slipper to meet the requirements of the wearer.

It is a further object of this invention to construct a flyers boot which is simple and durable and vwhich maybe manufactured and sold at a reasonable cost,

For further comprehension of the invention, and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:

Fig, 1 is a front perspective View of a iiyers boot constructed in accordance with thils invention.

Fig. 2 is a side elevational view of the inner slipper per se.

Fig. 3 is a front elevational view of Fig. 2,

Fig. 4 is an enlarged vertical sectional view taken on the line 4-4 of Fig. 2.

Fig. 5 is a view similar to Fig. 2 but illustrating a modiiication of the invention.

Fig. 6 is an enlarged partial vertical sectional View taken on the line 6-5 of Fig. 5.

Fig. 7 is another view similar to Fig. 2 but illus- 2 trating a still further modification of the invention.

Fig. 8 is an enlarged vertical sectional View taken on the line 8--8 of Fig. 7.

The flyers boot, according to this invention, includes an outer boot I0 of leather or other similar material and provided with a durable bottom sole II. The outer boot I0 is further formed with a front opening adapted to be closed by means of a lace I2.

Inserted into the outer boot I0 is an inner slipper constructed entirely of felt or other similar heat retaining material, The bottom of the slipper I3 is closed by means of a felt piece I4 secured in position by stitches I5. Fastening elements I6 in the form of complementary snap fasteners are provided between the top edges of the boot Iii and slipper I3 for releasably securing the slipper in position within the boot to .limit relative movement of these parts when the assemblage is worn,

Flexible mounting pieces Il are extended along the inner walls of the slipper I3. The mounting pieces are constructed of asbestos or other similar fireproof insulating material, and have their adjacent edges secured together by lines of stitches I8. Stitches I9 in turn secure the edges of the mounting pieces in position within the slipper I3. Flexible heating windings 2U are mounted in position between the adjacent faces of mounting pieces I'I. These heating windings have their ends secured to an electric cable 2| which extends from the top vof the boot I0 and which terminates in a plug 22 adapted to be connected with al source. of electric power for energizing the winding to supply heat to keep the flyers feet warm when flying at extremely high altitudes.

The manner of using the boot is as follows:

First the inner slipper is engaged upon the boot and the foot with the slipper is engaged into the outer boot IIJ. The fastening elements It are then engaged with one another and the lace I2 is used for closing the front of the boot.

The ilyer then boards the airplane, and as extremely high altitudes are reached he inserts the plug 22 into an electric line to supply the required current to energize the heating windings 20 to supply heat to keep his feet warm,

In the modification of the invention shown in Figs. 5 and 6 the construction of the slipper is similar to that previously described except for the provision of a means for adjustably mounting the flexible mounting pieces I'I in position within the slipper I3.

In this form of the invention the mounting pieces I1 have their top and bottom edges formed with eyelets 23 aligned with complementary eyelets 24 formed in strips 25 extended along the top and bottom of the mounting pieces I1. The

strips 25 are spaced from the adjacent edges of the mounting pieces I1 and are attached to the inside faces of the slipper I3 by means of stitches 26.

Laces 2l are engaged through the aligned eyelets 23 and 24 and capable of being adjusted for lifting or lowering the position of the mounting pieces with relation to the strips 25 for vertically adjusting the position of the heating Winding to meet the requirements of the wearer. The ends of the laces 2'I are adapted to be tied together to maintain the adjusted positions of the mounting pieces I'I.

In other respects this form of the invention is similar to that previously shown and like reference numerals identify like parts in each of the several views.

In Figs. '7 and 8 a modification of the invention is illustrated which is similar to that shown in Figs. 5 and 6 except for the provision of a means for permitting the position of the heating winding to be adjusted without completely removing the boot.

In this form of the invention the bottom edge of the mounting pieces I'I are connected directly by means of stitches 2l to the top edge of an elastic strip 25 which in turn is secured at its bottom edge to the inside face of the slipper I3 by means of a line of stitches 26.

Thus, with the boot in position on the wearers foot, it is merely necessary to open the top of the boot to expose the lace 2l at the top thereof to be manually adjusted to lift or lower the mounting pieces II' and the enclosed heater windings 2U. The elastic strip 25 will respond to any adjustments made to the lace 2l to maintain the mounting pieces Il in a stretched condition within the slipper I3.

In other respects this form of the invention is similar to that previously mentioned and like reference numerals identify like parts in each of the several views.

It should be borne in mind that the inner slipper I3 should be made of inflammable felt or other inilammable material so that the boot cannot burn. The heat windings must be so designed that the temperature of the winding does not exceed 120. With this limit there is little danger of one burning his feet even though the insulation covering of the heating winding becomes damaged or broken. It is calculated that normally eight feet of wire is suilicient for one inner slipper. If a warmer boot is desired more wire should be used. Because the inner slipper is loose, and of felt it is possible to walk on the boot without feeling the wire.

While I have illustrated and described the preferred embodiments of my invention, it is to be understood that I do not limit myself to the precise constructions herein disclosed and the right is reserved to all changes and modications coming within the scope of the invention as defined in the appended claims.

Having thus described my invention, what I claim as new and desire to secure by United States Patent is:

l. A flyers boot, comprising an outer boot, an inner slipper for the boot and disposed within said outer boot, fastening elements for releasably securing said slipper within said boot, flexible mounting pieces mounted on the walls of said slipper, electric heating windings secured on said mounting pieces, and an electric cable for current and connected with said windings, and means for adjustably mounting said mounting pieces within said inner slipper.

2. A flyers boot, comprising an outer boot, an inner slipper for the boot and disposed within said outer boot, fastening elements for releasably securing said slipper within said boot, flexible mounting pieces mounted on the walls of said slipper, electric heating windings seciued on said mounting pieces, and an electric cable for current and connected with said windings, and means for adjustably mounting said mounting pieces within said inner slipper, comprising strips secured to the inner face of said inner slipper above and below said mounting pieces, said strips and mounting pieces having their adjacent edges formed with eyelets, and laces engaged through said aligned eyelets.

3. A flyers boot, comprising an outer boot, an inner slipper for the boot and disposed within said outer boot, fastening elements for releasably securing said slipper within said boot, flexible mounting pieces mounted on the walls of said slipper, electric heating windings secured on said mounting pieces, and an electric cable for current and connected with said windings and means for adjustably mounting said mounting pieces within said inner slipper, comprising an elastic strip secured to the inside face of said inner slipper below said mounting pieces and secured to the bottom edge of said mounting pieces, a strip secured to the inside face of said slipper above said mounting pieces, said mounting pieces having their top edges and the adjacent edges of said latter strip formed with adjacent eyelets, and a lace engaged through' said eyelets.

4. In a flyers boot, a slipper for engagement in an outer boot, ilexible mounting pieces positioned adjacent the inner walls of said boot, electric heating windings mounted in said mounting pieces, resilient means anchoring one of the ends of said mounting pieces to the inner walls of said slipper, and adjustable means anchoring the opposite ends of said mounting pieces to the adjacent inner walls of said slipper, so that the adjustable means may be adjusted to adjust the vertical positioning of said mounting pieces within said slipper within the confines of the expansion and contraction of said resilient means.

5. In a yers boot, a slipper for engagement in an outer boot, flexible mounting pieces positioned adjacent the inner walls of said boot, electric heating windings mounted in said mounting pieces, resilient means anchoring one of the ends of said mounting pieces to the inner walls of salti slipper, and adjustable means anchoring the opposite ends oi said mounting pieces to the adjacent inner walls of said slipper, so that the adjustable means may be adjusted to adjust the vertical positioning of said mounting pieces within said slipper within the connes of the eX- pansion and contraction of said resilient means, said adjusting means, comprising strips secured to the inside faces of said slipper above the freeends of said mounting pieces, and laces engaged through eyelets formed in the adjacent edges of said strips and mounting pieces.

EMIL M. BONYHADY. 

